In a car park, there are 42 buses and scooters. If there are 108 wheels altogether, how many scooters are there?
Number of
buses |
Wheels of
buses |
Number of
scooters |
Wheels of
scooters |
Total
wheels |
| 42 |
42 x 4 = 168 |
0 |
0 |
168 |
| 41 |
41 x 4 = 164 |
1 |
1 x 2 = 2 |
166 |
| 12 |
12 x 4 = 48 |
30 |
30 x 2 = 60 |
108 |
Total number of wheels if all the vehicles are buses
= 42 x 4
= 168
Big difference between the number of wheels between the buses and the scooters
= 168 - 108
= 60
Small difference between the number of wheels between a bus and a scooter
= 4 - 2
= 2
Number of scooters
= 60 ÷ 2
= 30
Answer(s): 30
